"On Monday authorities in Honduras arrested four people in connection with the murder of influential environmental activist Berta Cáceres two months ago."

"The Dutch chapter of the environmental activist group Greenpeace leaked on Monday what it called a trove of documents from the talks over a proposed trade deal between the European Union and the United States."

"Kenya's president set fire to thousands of elephant tusks and rhino horns on Saturday, destroying a stockpile that would have been worth a fortune to smugglers and sending a message that trade in the animal parts must be stopped."

"Halliburton and Baker Hughes, two major oil services companies, have called off their planned $35 billion merger, citing difficulties in obtaining approval from regulators as well as sharply lower energy prices."

"The bison could soon become the national mammal of the United States. Legislation approved by Congress would elevate the bison to a stature approaching that of the bald eagle, long the national emblem. There has not been an official mammal of the United States."

Activist Jennie Romer, a lawyer who got bills banning plastic bags from stores passed in California, moved to New York to do the same thing in New York City.

"The quest for answers for thousands of veterans sickened -- in some cases terminally -- by contaminated water at Camp Lejuene has been stymied by a federal agency that refuses to hand over key documents, attorneys from Yale Law School charged Wednesday."

"Amid growing concern that flame retardants are responsible for elevated cancer rates in firefighters, Massachusetts lawmakers are pushing legislation that would go further than any other state’s in banning the use of chemicals meant to slow the spread of fires."

"Rangers at southern Utah's Arches National Park were investigating large graffiti Thursday that was carved so deeply into a famous redrock arch that it might be impossible to erase, officials said."